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S8340 Datasheet(PDF) 2 Page - Seiko Instruments Inc |
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S8340 Datasheet(HTML) 2 Page - Seiko Instruments Inc |
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2 / 55 page  STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8340/8341 Series Rev.4.0_01 2 Block Diagrams (1) S-8340/8341 Series A and C Types (Output Voltage Fixed Output Type) CS RS R2 R1 CC VSS VOUT VOUT SD CL ON/OFF VDD L EXT Shutdown circuit VIN CVREF CVREF CSS CSS Nch Power MOS FET 120 mV RSENSE SENSE PWM comparator Error amplifier VREF =1.0 V + PWM, PWM/PFM switching control circuit Triangular wave oscillation circuit Phase IC internal power compensation Soft-start circuit Voltage/current reference circuit supply Figure 1 (2) S-8340/8341 Series B and D Types (Output Voltage External Setting Type) CS RS RFB2 RFB1 CFB VSS VOUT FB SD CL ON/OFF VDD L EXT VIN CVREF CVREF CSS CSS Nch Power MOS FET 120 mV RSENSE SENSE PWM comparator VREF =1.0 V + Triangular wave oscillation circuit Phase compensation circuit IC internal power supply Error amplifier PWM, PWM/PFM switching control circuit Shutdown circuit Soft-start circuit Voltage/current reference Figure 2 |
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